Is CHEK2 p.Pro85Ser (c.253C>T) pathogenic?

CHEK2 p.Pro85Ser (c.253C>T) is classified Uncertain significance in CHEK2 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2024-12-23). AlphaMissense: likely benign (0.0879); Very rare (popmax 0.00134%, afr); Associated with hereditary breast carcinoma.

What condition is associated with CHEK2 p.Pro85Ser (c.253C>T)?

CHEK2 p.Pro85Ser (c.253C>T) is associated with hereditary breast carcinoma, hereditary neoplastic syndrome (ClinVar).

How common is CHEK2 p.Pro85Ser (c.253C>T) in the general population?

CHEK2 p.Pro85Ser (c.253C>T) is very rare (popmax 0.00134%, afr) (gnomAD).

How is Hereditary breast cancer inherited?

Typically Autosomal dominant, Multigenic/multifactorial (Orphanet). A genetic counselor can assess individual risk for a family.

What do computational predictors say about CHEK2 p.Pro85Ser (c.253C>T)?

AlphaMissense predicts likely benign (score 0.0879) — an in-silico prediction, not a clinical call.

CHEK2 p.Pro85Ser

c.253C>T · rs1366081066 · VCV821450

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

likely benign

0.0879 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00134%, afr)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

hereditary breast carcinoma

Computational evidence

Protein change
AlphaMissense	0.0879	likely benign
REVEL	0.182	moderately benign-leaning
SaProt	LLR -8.82	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 8.4	GERP 1.5, phastCons 1
Regional constraint	o/e 1.02	unconstrained · MANE · 47 kb · p 0.57 · regional, not allelic
Overall
CADD	17.39	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00134% African / African-American · 1/74,880 alleles

Filtering AF 6.8e-05% ClinGen BA1/BS1 input FAF95, joint · FAF99 1.9e-05%

Overall 0.000248% 4/1,613,558 alleles · very rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00134%	74,880
European (non-Finnish)	0.000254%	393,260

Rarity supports pathogenicity (ACMG PM2); frequency above a disease-specific BA1/BS1 threshold argues against it. A variant frequent in one ancestry group can be near-absent in others, so a single global figure can mislead.

Variant & gene context

Gene: CHEK2
Protein: p.Pro85Ser
Coding: c.253C>T
MANE Select: NM_007194
dbSNP: rs1366081066
Type: single nucleotide variant
Location: chr22:28734469 (GRCh38)
Gene constraint: LOEUF 1.399 · pLI <0.01 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 77.64 · 38 PDB
Residue 85: a UniProt-annotated variant site (found in an osteogenic sarcoma sample; somatic mutation)

Full CHEK2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

hereditary breast carcinoma — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: hereditary neoplastic syndrome

For Hereditary breast cancer (Orphanet):

Inheritance: Autosomal dominant, Multigenic/multifactorial
Onset: Adult, Elderly

Similar variants

CHEK2 p.Pro85His Uncertain significance ★★ ⚠ same residue
CHEK2 p.Pro85= Benign/Likely benign ★★ same residue
CHEK2 p.Pro85Leu Benign/Likely benign ★★ same residue
CHEK2 p.Pro85Ala Uncertain significance ★ ⚠ same residue
CHEK2 p.Pro85Arg Conflicting classifications of pathogenicity ★ ⚠ same residue
CHEK2 p.Pro85Thr Uncertain significance ★ ⚠ same residue
CHEK2 p.Pro85fs Pathogenic ★★ same residue
CHEK2 c.1008+1G>A Likely pathogenic ★★ same condition

Built on 18 open, versioned datasets — ClinVar, gnomAD, AlphaMissense, REVEL, ClinGen & more — plus Sugi Variant's own cross-source analysis. Source data 2026-01–2026-10, ClinVar 2026-10. Full sources & versions →

Cite Sugi Variant

Gür T. Sugi Variant: A Deterministic Per-Variant Germline Reference from a Knowledge Graph for Humans and AI Agents. 2026. doi:10.5281/zenodo.21509445. This variant: https://sugi.bio/variant/chek2-p-pro85ser (accessed [today's date]).

Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown